Port Lavaca, TX 77979 Frost Dates
77979, near Port Lavaca, TX: the frost window
The last spring frost here typically falls around 02/01, about 157 days from today. Fall's first freeze usually shows up around 12/21, roughly 321 days after the last spring frost.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Port Lavaca, not a forecast for this year.
Stretching the season past the first frost
Port Lavaca's growing season runs out in roughly 16 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Port Lavaca's last frost
02/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/24 and only about 1 year in 10 sees frost after that.
Port Lavaca against the rest of the dataset
At roughly 321 frost-free days, Port Lavaca places 3,300 of 40,283 ZIP codes in this dataset. Within TX, it ranks 211 of 2,558.
Learn more
Two guides worth reading on 77979: the frost range, on how to read the range around Port Lavaca's dates instead of trusting one, and local microclimates, on what one yard in Port Lavaca can differ from the 77979 normal.